JPS6233186B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for floating and supporting a conveyed sheet and an apparatus therefor.

Conventionally, rollers have been generally used to convey belt-shaped sheets, but since the sheet and rollers are in constant contact, the surface of the sheet is easily damaged, and the resistance of the roller bearings causes If there is uneven rotation between the rollers, the tension on the sheet body will be uneven, and if the sheet body is weak, there is a danger that it will stretch or break.Furthermore, since the rollers are heavy, it will be difficult to follow changes in speed, and the sheet body will slip sideways. Since the adjustment is made by tilting the roller shaft, there are many problems such as a delay in following the movement of the sheet, making it difficult to perform quick control adjustments.

The present invention solves these problems, eliminates the risk of damaging the sheet surface, has small inertia and quickly follows fluctuations in conveyance speed, and allows even weak sheet objects to be processed at high speeds without the risk of being cut. A sheet that can be conveyed, quickly corrects lateral deviation, and always enables stable conveyance, and can be conveyed at high speed, and can be easily fed and stopped intermittently, and the speed can be easily controlled. An object of the present invention is to provide a method and device for buoyant support of a body. Therefore, the feature of the invention of the first floating support method is that the left and right edges of the sheet to be conveyed are located in the jet curtain-like upward airflow, and the lower surface of the sheet is Jets corresponding to the directions are applied at predetermined intervals in the longitudinal direction of the sheet body, the airflow and the jets form a rectangular pressure chamber, and a central jet is ejected at the left and right center of the rectangular pressure chamber. A pair of left and right pressure chambers are defined, the sheet body is supported in a floating manner, and furthermore, the upward airflow after passing over the left and right edges of the sheet body has an upward velocity component and is moved away from the left and right edges. It is at a distant point, and furthermore, the second
The supporting device according to the invention is characterized in that it has left and right ejection grooves corresponding to the lower portion near the left and right edges of the sheet to be conveyed, and front and rear ejection grooves corresponding to the width direction of the sheet. A shaped peripheral ejection groove is formed, and a central ejection groove is provided at a central position between the left and right ejection grooves to divide the rectangular peripheral ejection groove into left and right, and an inner width between the left and right ejection grooves is formed. The outer width is set such that the edge of the sheet to be conveyed is located between both widths.

Hereinafter, the present invention will be explained in detail based on illustrated embodiments.

In FIGS. 1 and 2, reference numeral 1 denotes a sheet to be conveyed, which may be a strip of paper, a plastic film, a thin steel plate, or the like.
A head portion 5 is disposed to form a jet curtain 4 by jetting air from the rectangular peripheral jet groove 3,
The sheet body 1 is supported without contact. That is, the sheet body 1 is supported in a floating manner with a corresponding surface 6 curved in an arc shape and a predetermined flying height, and the rectangular peripheral jet groove 3 corresponds to the vicinity of the left and right edges 7, 7 of the sheet body 1. It is formed of left and right ejection grooves 8, 8, and front and rear ejection grooves 9, 9 corresponding to the width direction of the sheet body 1. Further, reference numeral 10 denotes a central jet groove that divides the rectangular peripheral jet groove 3 into left and right parts.In the end, the peripheral jet groove 3 and the central jet groove 10 are combined to form a Japanese-shaped nozzle, and the air supply pipe 11 The air sent from the nozzle is ejected from the nozzle to form a jet curtain 4. A pair of left and right pressure chambers 19 that support the sheet body 1 by this jet curtain 4,
19 is formed.

FIG. 7 shows an example of the arrangement of the head portions 5, and the curved portions 2 of the sheet body 1.
The case where the change angle θ is 90 degrees is shown, but when using conventional rollers, 180 degrees was sufficient, but when supported by the head section 5, it is better to set the change angle θ to 90 degrees or less. preferable. This is because it is difficult to design the tension of the exposed sheet body 1 to be large.

As shown in FIGS. 2 and 3, the width W of the sheet body 1 is selected to be larger than the inner width A between the left and right jet grooves 8 and smaller than the outer width B. There is. In other words, the left and right jet grooves 8, 8
is set such that its inner width A is smaller than the width W of the sheet body 1, and its outer width B is larger than the width W of the sheet body 1. Even if the left and right jet grooves 8, 8 are opened parallel to each other as shown in FIG. 2, or if they are inclined inwardly by an angle α as shown in FIG. Even though
In both cases, as mentioned above, the inner and outer width A of the jet grooves 8, 8,
B is set, and the edges 7, 7 of the sheet body 1
However, the inner width A to the outer width B of the left and right jet grooves 8, 8
Located within the range of

Next, as shown in FIGS. 1 and 8, the head portion 5 that jets and forms the jet curtain 4 from the peripheral jet groove 3 and the central jet groove 10 is placed on the bisector of the change angle θ of the sheet body 1. It is configured to be inclined by a small angle β in the longitudinal direction with respect to M, so as to obtain a conveying force for conveying the sheet body 1 in the direction of arrow E. At this time, the sheet body 1 is fed in a curved manner as shown by the solid line in FIG. It is also possible to freely adjust the force and the speed of the sheet body 1. Moreover, if the head part 5 is tilted in the clockwise direction by a small angle in the longitudinal direction with respect to the bisector M of the change angle θ of the sheet body 1, contrary to FIG. 1 can be used to obtain braking force in the opposite direction to the arrow E, and the seat body 1
It is also easy to apply appropriate tension to. In this way, the head portion 5 is attached so as to be able to freely adjust its swing angle in the transport direction (vertical direction) of the sheet body 1.

Next, FIG. 4 and FIG. 5 show another embodiment, in which a pair of rollers 14, in which left and right rollers 12, 12 are arranged approximately on the same axis and with a predetermined gap 13, is arranged in two rows, front and rear. A head portion 5 is constructed by attaching it to a box body 15. Moreover, the mutual gap between the pair of rollers 14 and 14 is very small and they are brought close to each other, and a predetermined gap is provided between the roller 12 and the inner surface of the box body 15, thereby forming the rectangular peripheral jet groove 3. A central ejection groove 10 is also formed. Also in the case of this embodiment, the end edges 7, 7 of the sheet body 1 have an inner width A between the left and right jet grooves 8, 8.
The sheet body 1 is ejected from the ejection grooves 3 and 10 formed between the rollers 12 and 12 and between the rollers 12 and the inner surface of the box body 15. It is supported in a non-contact manner by a jet curtain 4. However, roller 1
2...... is rotatable, so suddenly the sheet body 1
This has the advantage that even if the sheet body 1 comes into contact, the resistance is small and the sheet body 1 can be prevented from being damaged.

Note that, as shown in FIG.
By slightly tilting the axis 17 of the roller 12, the roller 1
It is possible to prevent the sheet body 1 from shifting laterally when the sheet body 1 comes into contact with the sheet body 2 and is fed. In addition, as shown in FIG.
By making the entire structure adjustable by the angle β around the shaft 18, it is possible to freely adjust the conveying force and speed. Further, in the same part, the head part 5 can be tilted counterclockwise by an angle β around the shaft 18, so that the braking force can be adjusted or tension can be applied to the seat body 1 on the upstream side. It is also preferable to do so.

It should be noted that the present invention is of course not limited to the above embodiments, and for example, the deflection angle α of the left and right jet grooves 8, 8 can be freely changed as long as it is within the range of -60 degrees to +60 degrees. Contrary to FIG. 3, it is also possible to form jet curtains 4 outwardly from the left and right jet grooves 8, 8. In particular, as is clear from FIG. 2 and FIG. , far away from 7. Further, the ejection grooves 3 and 10 can be freely formed in a nozzle shape, a gap groove shape, or a slit groove shape.

As in the illustrated embodiment, the edge 7 of the sheet body 1,
7 is located within the range of the inner width A to the outer width B between the left and right jet grooves 8, 8, so if the sheet body 1 is inclined as shown by the broken line in FIG. state, the tilting restoring force is large, and the third
Even if the sheet body 1 skids to the left or right as shown by the broken line in the figure, it automatically and quickly restores to the state shown by the solid line, and has a large lateral slip restraining force (restoring force).
Stable transportation is possible.

In other words, if the sheet body 1 is tilted as shown by the broken line in FIG. 2, the pressure chamber 19 on the compressed side becomes smaller.
The pressure on the pressure chamber on the left side (in Figure 2) becomes greater than on the other side (on the right side in Figure 2), and the pressure in the left and right pressure chambers is restored to the state shown by the solid line, which is equal to each other.
While always keeping parallel to the corresponding surface 6 of the head part 5,
Stable conveyance of the sheet body 1 is performed. Also the third
When the sheet body 1 causes a sideways slip (lateral shift) to the left or right as shown by the broken line in the figure, the jet curtain 4, Due to the synergistic effect of the upward airflow of No. 4 and the external force caused by the pair of left and right pressure chambers 19, 19, the sheet body 1 automatically and quickly returns to the solid line position. In this way, stable transport was always achieved.

The sheet body floating support method and its device according to the present invention have the following significant effects due to the above-described configuration.

(b) When the seat body tries to tilt or wave, it is immediately corrected by the synergistic effect of the pressure difference between the left and right pressure chambers and the difference in lifting support force due to the rising air current, and returns to a stable normal posture.

(b) When the seat body tries to shift sideways from side to side, the sideways shift is suppressed by the synergistic effect of the lateral thrust caused by the rising air current where the edge of the seat body is located and the cushion pressure difference between the left and right pressure chambers. Its strength and resilience are enormous. Therefore, stable floating conveyance is possible.

(c) The buoyancy support force of the sheet body is provided by a clever combination of the dynamic energy of the upward airflow and the jet flow, and the static pressure of the pressure chamber, so that the air for the jet curtain can be used effectively without wasting it.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention;
The figure is a detailed cross-sectional view, FIG. 3 is a detailed cross-sectional view of another embodiment, FIG. 4 is a plan view of yet another embodiment, FIG. 5 is a side view of the same partially shown in section, and FIG. 7 is a side view showing an example of the arrangement of the head portion, and FIG. 8 is a diagram illustrating the direction changing curved portion. DESCRIPTION OF SYMBOLS 1... Sheet body, 3... Peripheral ejection groove, 5... Head portion, 7... End edge, 8, 9... Ejection groove, 10...
...Central ejection groove, 19...Pressure chamber, W...Width dimension,
A...Inner width, B...Outer width.

Claims (1)

[Scope of Claims] 1. The left and right edges of the sheet to be conveyed are located in a jet curtain-like rising air current, and a jet stream corresponding to the width direction of the sheet is applied to the lower surface of the sheet along the longitudinal direction of the sheet. forming a rectangular pressure chamber with the air flow and the jet flow, and ejecting a central jet flow at the left and right centers of the rectangular pressure chamber to form a pair of left and right pressure chambers; The conveyed object is characterized in that the sheet body is supported in a floating manner, and the upward air current after passing over the left and right edges of the sheet body has an upward velocity component and moves away from the left and right edges. A floating support method for the seat body. 2. A rectangular peripheral ejection groove is formed with left and right ejection grooves corresponding to the lower side near the left and right edges of the sheet to be conveyed, and front and rear ejection grooves corresponding to the width direction of the sheet, and further, the above-mentioned A central ejection groove is provided at the center position between the left and right ejection grooves to divide the rectangular peripheral ejection groove into left and right parts, and the inner width and outer width between the left and right ejection grooves are set at the edge of the conveyed sheet body. A flotation support device for a conveyed sheet body, characterized in that the edge is located between both widths.